Piston ring grinding lathe



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mibww: 0005M W. B. CLOSE PISTON RING GRINDING LATHE Filed May 28, 1921 3 Sheets-Sheet l 1,552,114 W. B. CLOSE PISTON RING GRINDING LATHE Filed May 28. 1921 3 $heet's x514 to Sept. 1, 1925. 1,552,114

W. B. CLOSE PISTON RING GRINDING LATHE 5 Sheets-Sheet :5

Filed May 28, 1921 Patented Sept. 1, 1925.

UNITED STATES oFFICEQ PAT WILLIAM B. oLosE, or ron rLAnp, INnIAnm PISTON-RING-GRINDING- LATHE.

Application filed May 28, 1921. Serial No. 473,394.

The object of my present invention,

broadly speaking, is to provide a piston ring grinding machine which will be simple in character, positive and precise in its results, easily operated and controlled, and which can be manufactured and sold at a comparatively low price.

Heretofore it hasbeen customary to completely finish the manufacture of piston rings before they are placed in operative 'position in the piston-head, and the placing of the rings in such position manifestly causes the rings to be unduly strained and they frequently become permanently untrue and therefore do not give the best results in practice, therefore the specific object of' this invention is to finish the formation of piston rings after the are in their finalposition in the piston, ut before placing them in their cylinders, in order that they will be absolutely true and properly fitted each to the particular place it is to operate in, thereby obtaining the best possible results.-

Other minor objects and particular ad vantages of my invention will suggest themselves in the course of the following description, and that which is new and useful will be correlated-in the appended claims.

The preferred means for carrying out the principles of myinvention in a practical manner is shown in the accompanying drawings, in which-Figure 1 is a top plan of the entire lathe in which my invention is incorporated. Figure 2 is a front side elevation of the same. Figure 3 shows the grinder and the grinder-yoke in elevation, also showing the tracks onwhich carriages are mounted. Figure 4 is a top plan view of the grinder and the work holder as in operative position. Figure. 5 is also a top plan view of the grinder and showing certain parts of the work holder in horizontal section. Figure 6 is similar to Fig. 5 except that the piston is shown in central horizontal section. Figure 7 is aside elevation. of a portion of a cylinder showing the piston rings to be operated upon. Figure 8 1s a perspective View of one of the dogs for holding the rings in place to be operated upon.

S1m1lar indices denote like parts throughout the several: views; in orderthat the con struction, the operation, and the advantages of my invention may be more fully understood and appreciated I will now takeup a detailed description. thereof, in which I will set forth the invention as fully and as comprehensively asI may.

Referring now to the drawings in detailz Numeral 1 denotes the pedestal which supports the lathe above a floor (not shown). Carried by the pedestal are the two horizontal .parallel tracks 2and 3 such as are common to lathes. i I v Mounted onthe left ends of said tracks is the propeller carriage 4 which has the up wardly extending brackets 5 and .6. which carry the drive-shaft 7 in the usual manner. Secured on the shaft? are the pulleys 8, 9 and 10 which are adapted to receive there-. on the belt 11, whereby the shaft may be revolved by power and at various speeds as desired. 7

*To the right :of the bracket 6 there is a head 12 secured. on the end of the shaft 7, and said head has a pinjl3 projecting to the right and-located atone side of the center thereof. The .head 12 has a peripheral channel 14 formed in its right-hand edge for the purpose hereinafter stated. The main carriage comprises the two sides, rails 15 and 16, which are connected by the cross member 17. The side rails '15 and 16 the same being geared to be moved to the right and the] left on said tracks by turning the hand-wheel 18.

Adjustably mounted on the right-hand portion of the tracks 2 and 3 is the minor work-support carriage, comprisingthe base 19 and the top 20, the latter carries the horizontal stem 21 in which latter is a screw shaft. whose left end terminates at the pointed centering tool 22. The said screw is adapted to be turned by the handle 23 in, order to move the tool 22 to the right or left to adjust it to the'work. Thestem 21 is adjustably secured in the top 20 by means of the handle 24. i

Numeral -25 denotes the yoke, whose feet 26 and 27 are adjustably secured on the The central portion of the yoke 25...is..e1.1:.. larged, and it has a eo npapatinely. large aperture formed therethrough'; whi'ch'ap'er ture is to receive the end ofv -tlie cylingilggical;

shell 30 therein, whereby said shell 30 may be removed and replaced;- .Theipurlposeiott making the shell removable is that a number Q r uch' shells; BQzmay-Xbe; provided; one? for.- each size. ring... or. piston to helground, by; which. itis evident. that simply choosing the proper shell ton. the. particnlan rings. to., be; ground one is enabled to use thexniachinefor) all sizes; of; ringsfby, sirnplysel'ectiiigithe proper'shelllfor the ringstoi beground."

Numerah 32. denotes an, ordinary: pistonhead; haying channels therearoundi in which, are; placed the. piston-rings 33, The. inside diameter. of the. shell:. "30 is. only. in.- finitesimally. more thanistheloutside diam-v eter of the head 82, in; orderithatthe.heart niay...slide snugly therein; and; the. channel 141s of the s'aine-fdepth asisthelthicknessiot the wall oftheihead .'32,-".vhereb y..the outside diameter oithe .head11'2' is precisely-the same as .is the. outside diameter; of the head 32 by which it is evident that they. niayfb'efan ranged as shown in Figl5, that is tandem. One end ofithe head32fis madeiclqsed the other end being open,; and a. cran1;l-ipin 36 v(ax-- tends across the 1 interior i of: the: head", as is shown in. Fig. 6,: the saine. beinglordinary construction; I Y .As is wellr'known theirings are cut on an angle thereby forming; .tw sharp: points at the'ends of the rings. In order .to;'holdsaid rings, "wherebytheylmayj-"be operated upon, I'employ a.securingdog 'foneach ring, an d in order? that the. said 1 dogs may... be em; ployed I cut off; .one otithe' "-cornersiof ri the ring, in: amount equal tothe size andzshape' otlthe steml'34fotthabody of thefdog shown in Fig. 8. 'Thispermits the dog to b placed in operative positionwith the ends of the ring contactedwith'eachiother, as shown in Fig. The shapelot thebodyi'35 causes it to act as a lockingca'n whereby.

when the ringsare; clampedg to closed pos tion with the"'peri phery thereof flush with lockv theirv respective ringsifroni rotation,

whereby they maybe properly'ioperated body. 35"Wlll engage the;sidesot.tl1e;.'cha-nnel infthe head thereby. preventing. movement O'tthe. dog, and; then. of. .coursethe-stem. 34 of the. .dogfWill c pr'eventithe ring; l fi froni turning in its channel. In other. wonds; By '1-easQn-..df-thef stemQI34e-being' located. atlthe end portion of the body 35 it is evident that the inclination of the ring to, turn in its its sharp edges will engage both walls of the channel and thereby locking the dog and thereby preventing the ring from turning in its channel.

Extendingup, from the side rail 16 of the main carriage is the bracket 37 which sup ports the table 38which in turn supports the;

elongatedfliorizontalz bearing; '89 in which latter' is. revolvably mounted the grinder shaft- 40; f

" Detachably secured; on the left end of; the.

shatt ldis the abradant-wheel'tl byyvhiclr the grinding is-tobe. done. Also mounted on. the table :38. is. the electric 111076.013 1 11.6. same. being connected; withv the) shah- 4b0, by;

means of the shattecouplingit y Electric current to, operate theinotor. is supplied. by nieansot; the wires. and: 151' whichleadito asource-ot powen The table: '38 is.v so inountedzthat it, may; be moved. forward and rearward "by simply, turningthe crank handleAG;

It should be understood that anotch 1']; is 1 formed through the]. shell 30. Opposite to they wheel 41 and: correspondingyin width with the width. of: said wheel; into Whichthe edge. 0t. said Wheel may enter.,- as s own.- f Figs. 4-, 5xand. 6.1

Operation: In practice; they ri1 gs .33 to channels; in the piston-hfead, after; which the head 32;;is; placeddn. position in; onneetien with th head 12,: .thauiswiththe ne; nd Qt Ether 4 ead 32 toward theIheadi-12 .wi' hithn edge. of the head :32 fitting in; t e. chan el 14:, which or course, will: bring the pin} 1 5; to where. it wilhengage, the, pin 35; when the-parts 1 are; rotated. The. neXt; operation will be .to-revo-lve the wheel. v1.8 to cause the maincarriage totmove-tto the; lett, thereby causing the. shell; 30- 1103; slide over the head 32; and: partly cover thehead 12 thereby eiicloingthehead 3.2. 'Next the. crank; 23-

is to be revolved; tocause the, tQOl 22. t

move to; the'left until the point, 0 f the 'tpol 22/ engages. the center of the. closed end of the head32, as in Fig. 6..

It of; course is to; be understood; that; the main: carriage. has; been... moved until the ring, 33 to ,i be; ground is; exposed at the notch 47; that. islqa portion thereof; regis; terswith saidgnotchi Atter the. above. mentioned arrangements 7 have been fnadeethe'n the.v powen; iS Q-.. b' app-li ed-ztowoperatel the belt. 11; which of course will 1 revolve the head. 12; andby rea? son of Zthe-pin 13;engaging, with vthecrank;

pin .36. it. is evident, that the head will be; revolved; slowly within the; shel1;z @,:.a.n;d will carry with: it the. .p ist zr ngs i .3: WhiQh are, secured; theretoi by 111181, dog 8:);

The operator may now turn the crank 46- to move the table 38 slowly forward, finally bringing the revolving wheel 41 into grinding contact with the slowly revolving ring After that particular ring has been ground to the desired degree the expansive force of the ring will cause it to contact with the shell 30 at all times. After one ring is finished then the wheel 18 should be turned to move the main carriage to bring the next ring 33 to be ground into alinement with the notch 47, after which the second ring may be ground in like manner as the first; and these operations are repeated until all of the rings are ground in that head.

Prior to, and during the time any one of the rings 33 is being ground, and after they are ground, they will at all times contact with the shell 30, by reason of the inclination of the rings to expand. I

It has been found by actual tests that piston-rings which have been fitted and ground in the manner above set forth give better results in practice, as each ring is ground to the position where it is to operate.

It is to be understood that I am not to be limited to the particular type of lathe construction herein shown, neither am I limited to the several details of construction set forth, but various changes may be made therein as desired to meet varying conditions which may transpire.

Having now fully shown and described my invention and the best means for its construction and operation to me known at this time, what I claim and desire to secure by Letters Patent of the United States, is

A piston ring grinding attachment for lathe carriages comprising a yoke having feet adapted to rest on and be adjustably secured to the side rails of a lathe carriage said yoke being provided with shell receiving opening having axial alinement with the head and'tail stock of the lathe, a piston receiving shell removably held in said yoke and provided with a narrowlateral aperture wherethrough the edge of a grinding disk may pass, and grinding means adjustably supported by said lathe carriage, and including a base, means to feed the base across the carriage, a shaft supported revolubly on the base in 'parallelism to the axis of'the shell, a grinding disk carried by the shaft and'movable by the feed means into and out of said aperture, and means to drive said shaft. p

In testimony whereof I have hereunto subscribed my name to this specification.

WILLIAM CLOSE. 

